I tried playing back my MIDI tracks yesterday on my MBox Pro Tools 6.9 and couldn't get a MIDI signal from the tracks. I can see the signal bars on my computer screen flashing but I don't see the MIDI light on my external MIDI box lighting up. I checked my MIDI settings in Pro Tools, I made sure the right MIDI Out put was selected, I re-installed my MIDI drivers & Pro Tools, and I ran the MIDI file in my Cubase program (and everything worked fine). Can someone help me with my MIDI problems. This problem just started. I was able to get a MIDI signal when I was working on a project this summer.